I bought my car with an older Fabspeed exhaust with mufflers. I think it is a predecessor to the current MaxFlo. My understanding is that they've quieted the MaxFlow down a bit. Mine are a bit loud and drone at times, but I LOVE the way they sound when I really get on the car!

And despite the fact the fact the exhaust has several years of age on it, the exhaust system still looks great!

 

I have the Fister-modified stock mufflers and I can't imagine anything I would like any better. When cruising you'd never know they're there, but when you get on it they have a seriously aggressive sound. Depends on how hard you want to press the go-pedal.

 

I have some which are very similar to Kline , they are power flow, available on eBay , well made but much lower prices!!

 

I had the cat bypass pipes on my C2 with PSE modded mufflers and it sounded a little raspy. I will try the cat bypass pipes on my C4S with the stock non modded mufflers and see if it sounds any less raspy.